I spent so much time fixing vignetting for my C6D on the OTA and then once I did the full spectrum modification, I was after a OWB filter for regular photo use. I ordered it and it cut off the bottom of the sensor field. I thought that I had done something wrong. I had already ordered the other two. They showed the same issue. I was ****. All the work for at full frame sensor and the clip in was worse for vignetting than my OTA was to start with. I contacted Astonomiks and they basically said, well at least you still get a good part of the sensor. Basically they knew about it and did not put anything about the issue on the web site. I just went back to 2" filters on the nose piece at that point and have not used these filters since. If you dont mind have the bottom of the sensor obscured, and crop it off, then this do work, but than just get an ASP-C camera.

I spent so much time fixing vignetting for my C6D on the OTA and then once I did the full spectrum modification, I was after a OWB filter for regular photo use. I ordered it and it cut off the bottom of the sensor field. I thought that I had done something wrong. I had already ordered the other two. They showed the same issue. I was ****. All the work for at full frame sensor and the clip in was worse for vignetting than my OTA was to start with. I contacted Astonomiks and they basically said, well at least you still get a good part of the sensor. Basically they knew about it and did not put anything about the issue on the web site. I just went back to 2" filters on the nose piece at that point and have not used these filters since. If you dont mind have the bottom of the sensor obscured, and crop it off, then this do work, but than just get an ASP-C camera.

That's too bad. Crazy that they would sell something knowing it has inherent design flaws.